EP3221711A1 - System and method for inspection of a generator stator core step iron region with the rotor in-situ - Google Patents
System and method for inspection of a generator stator core step iron region with the rotor in-situInfo
- Publication number
- EP3221711A1 EP3221711A1 EP15860786.1A EP15860786A EP3221711A1 EP 3221711 A1 EP3221711 A1 EP 3221711A1 EP 15860786 A EP15860786 A EP 15860786A EP 3221711 A1 EP3221711 A1 EP 3221711A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- inspection
- carriage
- stator core
- generator
- coil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 160
- 238000007689 inspection Methods 0.000 title claims abstract description 153
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 80
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims description 24
- 238000009413 insulation Methods 0.000 claims abstract description 36
- 230000005284 excitation Effects 0.000 claims description 21
- 238000003780 insertion Methods 0.000 claims description 16
- 230000037431 insertion Effects 0.000 claims description 16
- 230000008878 coupling Effects 0.000 claims description 8
- 238000010168 coupling process Methods 0.000 claims description 8
- 238000005859 coupling reaction Methods 0.000 claims description 8
- 238000013519 translation Methods 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 claims description 5
- 239000006261 foam material Substances 0.000 claims description 4
- 230000002596 correlated effect Effects 0.000 claims description 2
- 238000013016 damping Methods 0.000 claims 4
- 238000003475 lamination Methods 0.000 description 10
- 230000013011 mating Effects 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 3
- 238000006731 degradation reaction Methods 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- 230000004323 axial length Effects 0.000 description 2
- 230000000875 corresponding effect Effects 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 230000006855 networking Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
Definitions
- the invention relates to generator stator core lamina insulation inspection. More particularly, the invention relates to methods and systems for inspection of step iron region stator core lamina insulation that is performed while the rotor is in situ, with an Electro-magnetic Core Imperfection Detector ("EL CID").
- EL CID Electro-magnetic Core Imperfection Detector
- An EL CID detects potential hot spots electromagnetically by exciting the stator core and then measuring any resulting fault or eddy currents flowing through a damaged region.
- the inspection system is inserted within the rotor gap while the rotor remains in situ within the generator.
- the EL CID system's eddy current sensing Chattock coil is mounted on a pivoting extension arm, and remains in abutting contact with the generator core circumference in the step iron region, despite the step-like profile of the core circumference in that region.
- FIG. 1 is illustrative of an exemplary known generator 20, which includes a rotatable rotor 22.
- the respective axial ends of the rotor are
- the generator 20 includes a stator core 26, which defines a cylindrical bore 28, circumscribing the rotor 22.
- the core bore 28 has a generally constant diameter portion 30, except at its axial ends, where the diameter increases along the axis towards each respective end.
- the increase in bore diameter is stepped, so the portion adjacent to each axial end of the stator core is referred to as "step iron" 32.
- the step iron portion 32 facilitates in reducing the magnetic flux densities at the ends of the stator core 26.
- the rotor 22 and stator core 26 are radially separated by a rotor gap 34, which is accessible from an axial end of the generator 20 in the annular volume between the step iron 32 and the rotor retaining ring 24.
- the stator cores 26 of electrical generators 20 and other electrical machines are made up of a stack of several, for example, thousands of individual steel sheets or laminations 36.
- the thickness of an individual sheet 36 is typically measured in thousandths of an inch.
- Each of the laminations 36 is coated with a thin layer of electrical insulation to insulate it electrically from its neighbors. This insulation prevents the alternating magnetic flux in the stator core 26 from inducing eddy currents between laminations 36. If the insulation between adjacent laminations 36 becomes damaged during assembly, operation, or maintenance, a conducting path may be formed through which currents are induced by the alternating flux. These conducting currents create "hot spots" which, if undetected, can result in damage to the machine.
- An EL CID system detects potential hot spots electromagnetically by exciting the stator core 26 with an externally supplied current source and then measuring any resulting fault currents flowing through a damaged region.
- the EL CID system's sensors are held against the stator core laminations 36 inside the stator core bore 28, where the laminations 36 define the stator bore 28 circumference.
- the system sensors typically are then translated or transported along the axial length of the stator core 26, though other translation paths may be chosen. As the sensors scan axially along the length of the core, they produce an analog signal having a magnitude proportional to detected fault currents. By examining a plot of the magnitude of the analog signal versus the sensor distance along the length of the core, operators are able to detect the location of a damaged insulation.
- the scanning operation at the main section of the stator core 26, may carried out by an automated tool, for example by using a belt driven carriage for the sensor riding on the inside diameter of the stator core 26 in an axial direction, as shown in United States Patent No. 4,803,563.
- an automated tool for example by using a belt driven carriage for the sensor riding on the inside diameter of the stator core 26 in an axial direction, as shown in United States Patent No. 4,803,563.
- the step iron portion 32 of the stator core 26 it is difficult to obtain accurate readings from the sensor due to the abrupt changes in contour axially over that region.
- the stepped changes in the region's contour make it difficult to move the sensor over that region by use of a carriage or manually, to avoid distorted outputs.
- a source of output distortion is the inability to maintain constant relative distance and alignment of the stator core bore 28 circumferential surface and the scanning sensor. It is more difficult to avoid distorted EL CID scanning sensor outputs when an automated tool of the above-mentioned type of United States Patent No. 4,803,563 is used to move the sensor over the step iron portion 32, though the tool
- Exemplary embodiments described herein are directed to inspection of generator stator core lamina insulation, particularly in the step iron region, while the generator rotor remains in situ, with an Electro-magnetic Core Imperfection
- EL CID EL CID Detector
- An EL CID detects potential insulation degradation hot spots electromagnetically by exciting the stator core and then measuring any resulting fault or eddy currents flowing through a damaged region. Detected eddy currents are indicative of insulation degradation.
- the inspection system carriage and its pivoting extension arm are inserted within the generator's rotor gap while the rotor remains in situ within the generator.
- a proximal end of the extension arm is pivotally coupled to the carriage.
- the extension arm is pivotally coupled to an aft end of the carriage, and trailing the carriage translation direction within rotor gap during an inspection procedure.
- the EL CID system's eddy current sensing coil is mounted in a coil assembly, which includes housing for the sensing coil.
- the coil assembly housing is in turn pivotally mounted on a distal end of the extension arm.
- a sensing surface of the coil housing remains in parallel abutting contact with the generator core circumference in the step iron region, despite the step-like profile of the core circumference in that region, so that the signal sensed by the sensing coil is not influenced by relative sensing surface-core circumference alignment variances.
- Exemplary embodiments of the invention feature an inspection apparatus for inspecting a step iron region of a generator stator core bore, while the rotor remains in situ therein.
- the step iron region is oriented proximate an axial end of the generator stator core, and the generator defines a rotor gap between the stator core bore and its opposed rotor along an axial dimension of the stator core bore.
- the inspection apparatus includes a translatable inspection carriage, having a bottom surface.
- An extension arm has a proximal end pivotally coupled to the inspection carriage by an extension arm pivot mount along a first pivot axis.
- the inspection apparatus also has an EL CID system eddy current sensing coil assembly, which in an exemplary embodiment comprises a Chattock coil that is retained in coil housing.
- the coil housing defines an elongated sensing surface.
- the sensing coil assembly also has a coil housing pivot mount that is pivotally coupled to a distal end of the extension arm along a second pivot axis that is parallel to the elongated sensing surface.
- the carriage bottom surface is in opposed orientation with the generator core, and the second pivot axis is oriented tangentially to radii defined by the stator core circumferential surface, including radii defined by the core's step iron region.
- the Chattock coil sensing surface remains parallel with and in abutting contact with the stator core circumferential surface defined by the core's step iron region, as the Chattock coil assembly is translated along the stator core's axial dimension by the inspection carriage.
- the extension arm first pivot axis is oriented parallel with the chassis bottom surface, while the second pivot axis is parallel with the first pivot axis.
- the carriage bottom surface is in opposed orientation with the generator core, and the first and second pivot axes are oriented tangentially to radii defined by the stator core circumferential surface, including radii defined by the core's step iron region.
- Chattock coil sensing surface remains parallel with and in abutting contact with the stator core circumferential surface defined by the core's step iron region, as the Chattock coil assembly is translated along the stator core's axial dimension by the inspection carriage during an EL CID inspection procedure.
- an inspection crawler for insertion within the previously described rotor gap between a generator core bore, including a step iron region thereof, and an opposed rotor, includes a translatable inspection carriage, having a bottom surface; and an extension arm.
- the extension arm has a proximal end pivotally coupled to the inspection carriage by an extension arm pivot mount along a first pivot axis.
- the inspection system carriage includes a sensing coil assembly, such as a Chattock coil assembly, having: a coil housing retaining a Chattock coil, an elongated sensing surface defined by the coil housing, and a coil housing pivot mount that is pivotally coupled to a distal end of the extension arm along a second pivot axis that is parallel to the elongated sensing surface.
- the EL CID inspection system also includes an eddy current excitation generator, for coupling to a generator stator core bore and generating an excitation current therein; and an eddy current inspection analyzer system, coupled to the Chattock coil, for correlating changes in coil output signal with variations in lamina insulation properties.
- the inspection carriage is inserted within a generator rotor gap, with the carriage bottom surface in opposed orientation with the generator core.
- the second pivot axis is oriented tangentially to radii defined by the stator core circumferential surface, including radii defined by the core's step iron region, so that the Chattock coil sensing surface remains parallel with and in abutting contact with the stator core circumferential surface defined by the core's step iron region, as the Chattock coil assembly is translated along the step iron region's axial dimension by the inspection carriage.
- the system's eddy current excitation generator is coupled to and generates excitation current within the generator core bore
- the inspection carriage, with its Chattock coil sensing surface is moved about the rotor gap.
- the eddy current inspection analyzer system monitors changes in the Chattock coil output that are in turn correlated with variations in lamina insulation properties within the step region.
- Additional exemplary embodiments of the invention feature methods for inspecting lamina insulation within a step iron region of a generator stator core bore, while the rotor remains in situ therein.
- a provided generator has a rotor circumscribed by a stator core bore, and a step iron region oriented proximate an axial end of the generator stator core. The generator defines a rotor gap between the stator core bore and its opposed rotor along an axial dimension of the stator core.
- the provided, previously described EL CID eddy current inspection system includes an inspection crawler, having a translatable inspection carriage.
- the carriage includes a bottom surface, and an extension arm having a proximal end pivotally coupled to the inspection carriage by an extension arm pivot mount along a first pivot axis.
- the provided inspection system includes a Chattock coil assembly.
- the Chattock coil assembly includes a coil housing retaining a Chattock coil, an elongated sensing surface defined by the coil housing, and a coil housing pivot mount that is pivotally coupled to a distal end of the extension arm along a second pivot axis that is parallel to the elongated sensing surface.
- the inspection method uses an eddy current excitation generator, coupled to the generator stator core bore, which generates an excitation current in the bore.
- An eddy current inspection analyzer system is coupled to the Chattock coil, for correlating changes in coil output signal with variations in lamina insulation properties.
- the inspection carriage is inserted within the generator rotor gap so that the carriage bottom surface is in opposed orientation with the generator core circumferential surface.
- the carriage inserted into the rotor gap with the extension arm trailing the carriage.
- the carriage is translated along the stator core axial dimension; so that the Chattock coil sensing surface is parallel with and in opposed abutting contact with the stator core circumferential surface defined by the core's step iron region.
- the eddy current excitation generator is coupled to a generator stator core bore, which in turn generates an excitation current therein, before or after the inspection carriage insertion.
- the eddy current inspection analyzer system is coupled to the Chattock coil, before or after inspection carriage insertion; for receiving an output signal therefrom and correlating the output signal with lamina insulation properties.
- the Chattock coil sensing surface is translated along the step iron region by translating the carriage along the stator core, changes in the Chattock coil output signal are monitored with the eddy current inspection analyzer system.
- the method further comprises translating the Chattock coil sensing surface inboard of the step iron region by translating the carriage along the stator core and monitoring changes in the Chattock coil output signal with the eddy current inspection analyzer. In this way, it is possible to inspect stator core lamina insulation axially across part, or the entire stator core, as is desired.
- the carriage has magnets, for magnetically attracting the carriage bottom to the generator core bore.
- the carriage has a motorized drive system, for selectively translating the carriage along the generator core bore.
- an encoder wheel is coupled to the carriage and generating an encoder output signal. The encoder output signal is then utilized, directly or indirectly, by the eddy current analyzer system, in order to correlate the encoder output signal with relative translation position of the carriage within the stator core bore. As the carriage is translated along the generator core bore, the eddy current analyzer system identifies localized variations in lamina insulation in the stator core step region and, if desired, in other stator core regions.
- FIG. 1 is a cross sectional elevational view of an exemplary known, prior art generator, including the stator core step iron region, an in-situ rotor, a rotor retaining ring, and the rotor gap that is defined between the stator core and rotor;
- FIG. 2 is a fragmentary perspective view of a rotor core step iron region being inspected for lamina insulation defects with an inspection crawler apparatus, in accordance with exemplary embodiments of the invention;
- FIG. 3 is a perspective view of the inspection crawler apparatus of FIG. 2;
- FIG. 4 an exploded view of the inspection crawler apparatus of FIGs. 2 and 3;
- FIG. 5 is a schematic block diagram of an inspection system, including the inspection crawler apparatus of FIG. s 2 and 3, in accordance with an exemplary embodiment of the invention
- FIG. 6 is a fragmented perspective view showing the crawler apparatus of FIG. 2 being inserted into the rotor gap space between the rotor and stator core, including the core's step iron region, with an insertion tool, in accordance with an exemplary embodiment of the invention, without removing the rotor; and
- FIG. 7 is a fragmented perspective view showing the crawler apparatus of FIG. 2 after insertion into the rotor core, with the EL CID sensing coil in contact with the rotor core's step iron region, after withdrawal of the insertion tool, in accordance with an exemplary embodiment of the invention.
- Exemplary embodiments of the invention are utilized for inspection of generator stator core lamina insulation, particularly in the step iron region, and as desired in the remaining portions of the stator core. The inspection is performed while the rotor is in situ.
- the exemplary embodiment's inspection systems utilize an Electro -magnetic Core Imperfection Detector ("EL CID") system, a portion of which is cou led to a carriage that is translated within the stator core, such as an automated crawler-type carriage.
- EL CID Electro -magnetic Core Imperfection Detector
- the EL CID system detects potential hot spots electromagnetically by exciting the stator core with an external current source, such as pulsed current source. Then the EL CID system measures any resulting fault or eddy currents flowing through a damaged region with a sensing coil.
- Variations in currents sensed by the sensing coil are associated with insulation faults.
- the inspection system carriage and its pivoting extension arm are inserted within the rotor gap while the rotor remains in situ within the generator.
- the EL CID system's eddy current sensing coil is mounted in a coil housing that is in turn pivotally mounted on a distal end of the extension arm.
- a sensing surface of the coil housing remains in abutting contact with the generator core circumference in the step iron region, despite the step-like profile of the core circumference in that region. Consistent alignment of the sensing surface and the generator core circumference eliminates alignment variances in the sensing coil measured current readings or data.
- FIG. 2 illustrates an exemplary embodiment of an EL CID inspection crawler 40 positioned on a stator core 26 of a generator.
- the stator core 26 has a stator core bore 28 with an axial axis that is aligned with its corresponding rotor's rotational axis, and includes a straight bore portion 30, along with a step iron portion 32 adjacent to one of the stator axial ends.
- the straight bore portion 30 has a generally constant diameter 30 along the axial direction, while the step iron portion 32 incorporates a stepped increase in diameter along the axial direction outboard of the adjoining straight portion 30.
- the stator core 26 also includes a plurality of axially extending slots 38, with the inspection device 40 being positioned along one of the slots 38.
- the crawler 40 is securely held in the slot 38 position, for example by magnetic force, which will be described in detail herein.
- FIGs. 3 and 4 respectively show perspective and exploded or unassembled views of an exemplary embodiment of the inspection crawler apparatus 40.
- the inspection device 40 broadly includes a carriage or main body 42, having a central channel and a carriage bottom surface 43 for contact with the stator bore 28 inner circumference.
- An aft end of the carriage 42 is coupled to a first hinge assembly 44, which includes an inboard hinge portion 46 with an incorporated first biasing element, such as a torsion spring.
- the biasing element in the first hinge assembly 44 exerts a torsional biasing force Bl on the first hinge outboard hinge portion 48.
- the respective inboard and outboard hinge portions 46, 48 are coupled by first hinge pin 50.
- the first hinge assembly 44 pivotal axis is generally parallel with the carriage bottom surface 43.
- a pivoting extension arm 52 has a proximal end pivotally coupled to the first hinge assembly 44 by the first hinge outboard portion 48, so that the extension arm trails the carriage 42, as the inspection crawler apparatus 40 translates from left to right in FIG. 2 (i.e., from the outboard step iron portion 32 toward the inboard straight portion 30 of the stator core 26).
- the extension arm 52 is constructed from sheet carbon fiber material for strength and flexibility.
- a distal portion of the extension arm 52 is pivotally coupled to a Chattock coil assembly 54.
- the exemplary Chattock coil assembly 54 comprises a coil housing coil holder 56 and a mating coil housing coil cover 58.
- a bottom surface of the housing coil cover 58 defines a sensing surface 60 that is aligned parallel to the abutting corresponding stator coil bore 28 circumferential surface profile.
- a coil housing pivot mount 62 which is also referred to as the second hinge assembly, includes a pair of mounting blocks 64 coupled to the distal end of the extension arm 52 and a mating coil housing hinge portion 66.
- the mounting blocks 64 and the mating coil housing hinge portion 66 are pivotally coupled by second hinge pin 68.
- the second hinge pin 68 establishes a second pivot axis, which is parallel to the sensing surface 60 and the first hinge 44 pivoting axis.
- the first pivoting axis established by the first hinge 44 and the second pivoting axis established by the coil housing pivot mount 62 are parallel to each other, as well as to the generally planar carriage bottom surface 43 and the sensing surface 60 of the coil housing coil cover 58.
- first and second hinge axes respectively defined by the first hinge 44 and the coil housing pivot mount 62 in this exemplary embodiment have two orthogonal axes of motion, ball and socket, universal joint or other types of three orthogonal axes range of motion hinge devices can be substituted in alternative embodiments, so long as the elongated, planar sensing surface 60 of the coil housing cover 58 has sufficient radial range of motion to be aligned parallel with the stator coil bore 28 circumferential surface in the relatively steep slope of the step iron region 32 or in any other desired region.
- the EL CID system's Chattock coil 70 is housed in the Chattock coil assembly 54 proximate the elongated, planar sensing surface 60, within the internal volume of the coil housing coil holder 56 and its mating coil housing coil cover 58.
- Chattock coil assembly 54 coil housing pivot mount 62 incorporates compressible foam material pads 72, which are interposed between the mounting blocks 64 and the coil housing hinge portion 66 laterally flanking the second hinge pin 68.
- the foam pads 72 comprise a second biasing element for biasing the elongated sensing surface 60 parallel with and in abutting contact with the stator core circumferential surface 28, in either clockwise or counterclockwise directions denoted by the arrow B2 of FIG. 3.
- the foam pads 72 also dampen chatter vibrations induced between the elongated sensing surface 60 contact with the stator core bore circumferential surface 28, such as in the step iron region 32, when the inspection crawler 40 is inserted within a generator rotor gap 34, and as the Chattock coil assembly 54 is translated along the stator core 26 axial dimension by the inspection crawler 40.
- the exemplary inspection crawler 40 incorporates a pair of motorized drives 74 to position the Chattock coil assembly 54 selectively at any desired axial position within the stator core 26 step iron region 32 or straight portion 30.
- the motorized drives 74 have permanent magnets embedded in their bottom surfaces, proximate the carriage bottom surface 43, which allows the drives 74 to be attracted to the stator core bore 28 circumferential surface at any circumferential angular orientation, 360 degrees around the stator core 26.
- the drives 74 have rubber belts so that the inspection crawler 40 can self-propel itself axially along the stator core bore 28.
- At least one of the drives 74 incorporates a digital encoder 75 to provide axial position information.
- the wire guide 76 facilitates passage of Chattock coil 70, drive system 74, and digital encoder 75 wiring to and from other EL CID inspection system components.
- Cover 80 shields the wire guide 76 and carriage 42 central channels. While not shown in the figures, the carriage bottom surface 43 incorporates one or more guides, which are inserted into the stator slots 38, to center the carriage 42 as it drives axially in the stator core bore 28.
- FIG. 5 is a schematic representation of the inspection system electronics of the entire inspection system 81, which include the inspection crawler 40 Chattock coil assembly 54, motorized drives 74, digital encoder 75, associated excitation current generator 82, eddy current inspection analyzer system 84, drive controller 86, and system computer 90.
- the Chattock coil 70 in the Chattock coil assembly 54 is coupled to the eddy current inspection analyzer system 84, which monitors the coil output signal.
- the inspection analyzer 84 enables manual or automated correlation of monitored coil output with eddy current generation, and associated localized lamination insulation degradation.
- the drive system 74 operation, to translate the inspection crawler 40 within a step iron region 32 or any other region within the stator core 26, is performed with the drive controller 86.
- the drive controller 86 uses the encoder 75 output signals to determine relative position of the inspection crawler 40 within the stator core 26. While Chattock coil assembly 54 output data and crawler apparatus 40 position can be monitored and recorded manually by a human operation, the exemplary inspection system integrates automatic data monitoring, recording and inspection crawler positioning functions though computer 90, such as a laptop or desktop computer. The computer 90 performs automated command and control functions through an internal processor and operating system, which together implement stored program instructions.
- exemplary controller platform architecture and implementation by software modules executed by the processor
- exemplary embodiments of the invention may be implemented in various forms of hardware, software, firmware, special purpose processors, or a combination thereof.
- aspects of the invention embodiments are implemented in software as a program tangibly embodied on a program storage device.
- the program may be uploaded to, and executed by, a machine comprising any suitable architecture.
- the machine is implemented on a computer platform having hardware such as one or more central processing units (CPU), a random access memory (RAM), and input/output (I/O) interface(s).
- CPU central processing units
- RAM random access memory
- I/O input/output
- the computer platform also includes an operating system and microinstruction code.
- the various processes and functions described herein may be either part of the microinstruction code or part of the program (or combination thereof) which is executed via the operating system.
- various other peripheral devices may be connected to the computer/controller platform.
- the inspection crawler apparatus 40 driven into the rotor gap 34 between the stator core 26 and the rotor retaining ring 24 with a paddle-like insertion tool 92, shown in FIG. 6.
- the insertion tool 92 has a flat, planar platform 94 and a permanently installed positioning handle 96.
- the planar platform 94 is placed over and aligned with the step iron 32 surface slope, which provides a stable, non-rocking, flat surface for the crawler apparatus 40 drives to gain traction and engage on the stator bore 28 circumferential surface.
- the insertion tool 92 allows the crawler apparatus 40 to drive on and off the stator core bore 28.
- FIG. 7 shows the inspection crawler 40 after it has been inserted into the stator core bore 28, with its Chattock coil assembly 54 in position in the step iron region 32.
- the insertion tool 92 was previously retracted from the stator gap region 34 prior to initiation of lamination inspection, until needed for subsequent withdrawal of the inspection crawler apparatus 40.
- a rotor lamina insulation scanning inspection with the EL CID system is performed after the inspection crawler 40 is driven into the stator core bore 28 within the rotor gap 34 to a desired axial location.
- the drive system 74 magnets attract the stator core 26, which holds the inspection crawler 40 in a fixed radial position. Electrical connections are established among the inspection crawler 40 Chattock coil 70 and the eddy current analyzer 84 (see connection node A of FIGs. 4 and 5); as well as the position encoder 75 (see connection node C of FIGs. 4 and 5) and the motorized drive system 74 (see connection nodes Dl and D2 of FIGs. 4 and 5) to the drive controller 86.
- An exemplary stator core lamina insulation inspection method involves energization of the stator core 26. This may include employing an excitation loop wire (usually of several turns) installed in the stator core bore 28. The excitation loop is then connected to a source of constant frequency amplitude-adjustable AC voltage and energized. Typically, in EL CID systems a chosen excitation frequency is 50Hz-60Hz. In some embodiments, excitation is performed at multiple frequencies within a frequency range of 50Hz-2MHz.
- the drive system 74 drive motors are activated and controlled, for example, remotely from the generator 20, to cause the Chattock coil assembly 54 and its sensing surface 60 to move axially along the stator core circumferential surface 28, at a predetermined speed, which may be constant or variable.
- the Chattock coil 70 is electromagnetically coupled, or is in electromagnetic communication with the energized stator core 26. As the Chattock coil 70 is maneuvered along the axial length of the stator core 26 bore surface 28, it picks up local eddy currents, in particular, fault currents due to faulty insulation in the stator laminations 36. A signal, typically of analog nature, is generated that corresponds to the magnitude of the locally measured eddy currents.
- a hot spot may be detected when the locally measured eddy current corresponds to a fault value.
- the Chattock coil 70 output analog signal is processed to determine whether it is indicative of an eddy current that is attributable to a lamination insulation failure.
- an evaluation is performed by the EL CID sensing system, by plotting the locally measured Chattock coil 70 output signal versus the axial distance that the Chattock coil assembly 54 has traveled.
- the Chattock coil assembly 54 travel distance is determined by accessing the position encoder 75 output readings with any one or more of the eddy current analyzer system 84, the drive controller 86 and/or the computer 90 that comprise the eddy current data generation and processing portions of the EL CID sensing system.
- the eddy current analyzer system 84, the drive controller 86, and/or the computer 90 are positioned outside of the generator 20 during the entire scanning procedure.
- the inspection crawler 40 optionally repositions the crawler 40 to the next or adjacent stator slot 38 (with or without the insertion tool 92), and repeat the scan procedure.
- Complete scanning of the step iron portion 32 on one axial end of the stator core 26; continuing with its inboard straight portion 30, and then the following step iron portion 32 on the opposite axial end of the stator core 26 can be followed by driving the inspection crawler 40 down the platform portion 94 of the insertion tool 92. Then the inspection crawler 40 is driven up the step iron portion 32 of the next adjoining stator slot 38, in zigzag fashion.
- the drive system 74 permanent magnets attract the inspection crawler 40 to the stator core 26 at any circumferential angular position about the stator core bore 28, so an entire internal surface of a stator core bore 28 can be scanned in a continuous zig-zag pattern, axially across all of the stator slots 38.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Tests Of Circuit Breakers, Generators, And Electric Motors (AREA)
- Manufacture Of Motors, Generators (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SI201530727T SI3221711T1 (en) | 2014-11-21 | 2015-11-19 | System and method for inspection of a generator stator core step iron region with the rotor in-situ |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US201462082670P | 2014-11-21 | 2014-11-21 | |
PCT/US2015/061526 WO2016081702A1 (en) | 2014-11-21 | 2015-11-19 | System and method for inspection of a generator stator core step iron region with the rotor in-situ |
Publications (3)
Publication Number | Publication Date |
---|---|
EP3221711A1 true EP3221711A1 (en) | 2017-09-27 |
EP3221711A4 EP3221711A4 (en) | 2018-07-25 |
EP3221711B1 EP3221711B1 (en) | 2019-02-06 |
Family
ID=56014550
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15860786.1A Active EP3221711B1 (en) | 2014-11-21 | 2015-11-19 | System and method for inspection of a generator stator core step iron region with the rotor in-situ |
Country Status (6)
Country | Link |
---|---|
US (1) | US10274541B2 (en) |
EP (1) | EP3221711B1 (en) |
ES (1) | ES2724999T3 (en) |
PT (1) | PT3221711T (en) |
SI (1) | SI3221711T1 (en) |
WO (1) | WO2016081702A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110514969A (en) * | 2019-07-29 | 2019-11-29 | 国网河北省电力有限公司电力科学研究院 | Electricity generator stator core insulation detection device and detection method |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6807821B2 (en) | 2017-10-31 | 2021-01-06 | 株式会社東芝 | Inspection system |
US10797552B2 (en) | 2017-12-05 | 2020-10-06 | Siemens Energy, Inc. | Tool system for tightening retightenable wedge system in slot of generator stator core |
JP6833670B2 (en) * | 2017-12-27 | 2021-02-24 | 株式会社東芝 | Inspection system and inspection method |
WO2022040139A1 (en) * | 2020-08-21 | 2022-02-24 | Siemens Energy, Inc. | Generator inspection tool |
CN111845993B (en) * | 2020-08-21 | 2023-05-09 | 无锡中车时代智能装备研究院有限公司 | Rotor crawling type in-bore detection robot device for generator |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3040998A (en) * | 1956-05-29 | 1962-06-26 | British Thomson Houston Co Ltd | Coil winding machine |
US4970890A (en) * | 1988-11-23 | 1990-11-20 | Westinghouse Electric Corp. | Electric generator inspection system |
US4889000A (en) * | 1987-02-11 | 1989-12-26 | Westinghouse Electric Corp. | Electric generator inspection system and motor controller |
US5105658A (en) * | 1987-02-11 | 1992-04-21 | Westinghouse Electric Corp. | Electric generator inspection system and motor controller |
US4803563A (en) * | 1987-09-02 | 1989-02-07 | Westinghouse Electric Corp. | Rotor-in-stator examination magnetic carriage and positioning apparatus |
US5341095A (en) * | 1993-01-27 | 1994-08-23 | Westinghouse Electric Corporation | Dynamoelectric machine stator test device |
US6791351B2 (en) * | 2002-06-28 | 2004-09-14 | Siemens Westinghouse Power Corporation | Electromagnetic stator insulation flaw detector |
US6876222B2 (en) * | 2002-11-12 | 2005-04-05 | Siemens Westinghouse Power Corporation | Automated stator insulation flaw inspection tool and method of operation |
US6912905B2 (en) * | 2003-07-11 | 2005-07-05 | Siemens Westinghouse Power Corporation | Automated tool for ultrasonic inspection of brazed joints |
US7520189B2 (en) * | 2006-10-27 | 2009-04-21 | Siemens Energy, Inc. | Generator inspection assembly |
US8823412B2 (en) * | 2012-03-06 | 2014-09-02 | Siemens Energy, Inc. | Device and method for inspection of a stator core of an electrical machine |
-
2015
- 2015-11-19 WO PCT/US2015/061526 patent/WO2016081702A1/en active Application Filing
- 2015-11-19 PT PT15860786T patent/PT3221711T/en unknown
- 2015-11-19 ES ES15860786T patent/ES2724999T3/en active Active
- 2015-11-19 SI SI201530727T patent/SI3221711T1/en unknown
- 2015-11-19 US US15/525,176 patent/US10274541B2/en active Active
- 2015-11-19 EP EP15860786.1A patent/EP3221711B1/en active Active
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110514969A (en) * | 2019-07-29 | 2019-11-29 | 国网河北省电力有限公司电力科学研究院 | Electricity generator stator core insulation detection device and detection method |
Also Published As
Publication number | Publication date |
---|---|
WO2016081702A1 (en) | 2016-05-26 |
US10274541B2 (en) | 2019-04-30 |
EP3221711A4 (en) | 2018-07-25 |
SI3221711T1 (en) | 2019-06-28 |
EP3221711B1 (en) | 2019-02-06 |
ES2724999T3 (en) | 2019-09-18 |
PT3221711T (en) | 2019-05-29 |
US20170363688A1 (en) | 2017-12-21 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US10274541B2 (en) | System and method for inspection of a generator stator core step iron region with the rotor in-situ | |
RU2293980C2 (en) | Method and system for detecting flaws of cores | |
US8823412B2 (en) | Device and method for inspection of a stator core of an electrical machine | |
US5747998A (en) | Apparatus for detecting anomalies in pipes | |
US6847207B1 (en) | ID-OD discrimination sensor concept for a magnetic flux leakage inspection tool | |
US5793205A (en) | Coil and guide system for eddy current examination of pipe | |
US20040257072A1 (en) | Dual-sensitivity eddy current test probe | |
US20120060611A1 (en) | Inspection vehicle for the inspection of substantially cylindrical objects | |
US6265870B1 (en) | Eddy current sensor assembly for detecting structural faults in magnetically permeable objects | |
US20090102473A1 (en) | Eddy current testing method and eddy current testing apparatus | |
US20040000923A1 (en) | Electromagnetic stator insulation flaw detector | |
CN109115867B (en) | Plane rotation eddy current detection sensor and detection method | |
WO2015190414A1 (en) | Nondestructive inspection device | |
KR101888766B1 (en) | Nondestructive testing device, and method for operating nondestructive testing device | |
JP2007232697A (en) | Device and method for inspecting roundness of inner circumference of cylindrical body | |
KR101686329B1 (en) | Cable inspection apparatus and multi-channel cable inspection apparatus | |
KR20090121747A (en) | Probe for eddy current testing and transporter thereof | |
AU2018214693B2 (en) | Electromagnetic method and device for detecting defects | |
US6215300B1 (en) | Eddy current wide probe | |
Lynch | Magnetic flux leakage robotic pipe inspection: Internal and external methods | |
JP4083940B2 (en) | Wire inspection method and apparatus | |
WO2006137553A1 (en) | Method for nondestructive testing of shielded signal wire | |
JP7299618B2 (en) | Eddy current flaw detector and method for manufacturing eddy current flaw detector | |
JP3058288B2 (en) | Piping flaw detection sensor | |
JP2000275223A (en) | Inspecting tool and its using method |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE |
|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE |
|
17P | Request for examination filed |
Effective date: 20170426 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
AX | Request for extension of the european patent |
Extension state: BA ME |
|
DAV | Request for validation of the european patent (deleted) | ||
DAX | Request for extension of the european patent (deleted) | ||
A4 | Supplementary search report drawn up and despatched |
Effective date: 20180626 |
|
RIC1 | Information provided on ipc code assigned before grant |
Ipc: G01R 31/34 20060101AFI20180620BHEP Ipc: G01R 31/12 20060101ALI20180620BHEP |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R079 Ref document number: 602015024483 Country of ref document: DE Free format text: PREVIOUS MAIN CLASS: G01R0031400000 Ipc: G01R0031340000 |
|
GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: GRANT OF PATENT IS INTENDED |
|
RIC1 | Information provided on ipc code assigned before grant |
Ipc: G01R 31/34 20060101AFI20180918BHEP Ipc: G01R 31/12 20060101ALI20180918BHEP |
|
INTG | Intention to grant announced |
Effective date: 20181018 |
|
GRAS | Grant fee paid |
Free format text: ORIGINAL CODE: EPIDOSNIGR3 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE PATENT HAS BEEN GRANTED |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: FG4D |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: EP Ref country code: AT Ref legal event code: REF Ref document number: 1095249 Country of ref document: AT Kind code of ref document: T Effective date: 20190215 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R096 Ref document number: 602015024483 Country of ref document: DE |
|
REG | Reference to a national code |
Ref country code: IE Ref legal event code: FG4D |
|
REG | Reference to a national code |
Ref country code: PT Ref legal event code: SC4A Ref document number: 3221711 Country of ref document: PT Date of ref document: 20190529 Kind code of ref document: T Free format text: AVAILABILITY OF NATIONAL TRANSLATION Effective date: 20190506 |
|
REG | Reference to a national code |
Ref country code: NL Ref legal event code: MP Effective date: 20190206 |
|
REG | Reference to a national code |
Ref country code: LT Ref legal event code: MG4D |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190206 Ref country code: LT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190206 Ref country code: NO Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190506 Ref country code: SE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190206 Ref country code: FI Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190206 |
|
REG | Reference to a national code |
Ref country code: AT Ref legal event code: MK05 Ref document number: 1095249 Country of ref document: AT Kind code of ref document: T Effective date: 20190206 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: BG Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190506 Ref country code: IS Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190606 Ref country code: GR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190507 Ref country code: RS Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190206 Ref country code: LV Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190206 Ref country code: HR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190206 |
|
REG | Reference to a national code |
Ref country code: ES Ref legal event code: FG2A Ref document number: 2724999 Country of ref document: ES Kind code of ref document: T3 Effective date: 20190918 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: CZ Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190206 Ref country code: RO Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190206 Ref country code: AL Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190206 Ref country code: SK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190206 Ref country code: DK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190206 Ref country code: EE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190206 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R097 Ref document number: 602015024483 Country of ref document: DE |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SM Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190206 Ref country code: PL Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190206 |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: AT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190206 |
|
26N | No opposition filed |
Effective date: 20191107 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: TR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190206 |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: MC Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190206 Ref country code: CH Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20191130 Ref country code: LI Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20191130 Ref country code: LU Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20191119 |
|
REG | Reference to a national code |
Ref country code: BE Ref legal event code: MM Effective date: 20191130 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20191119 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20191119 Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20191130 Ref country code: IE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20191119 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: BE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20191130 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: CY Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190206 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: HU Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT; INVALID AB INITIO Effective date: 20151119 Ref country code: MT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190206 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: MK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190206 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R082 Ref document number: 602015024483 Country of ref document: DE Representative=s name: ROTH, THOMAS, DIPL.-PHYS. DR., DE |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: ES Payment date: 20231219 Year of fee payment: 9 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: SI Payment date: 20231030 Year of fee payment: 9 Ref country code: PT Payment date: 20231030 Year of fee payment: 9 Ref country code: IT Payment date: 20231124 Year of fee payment: 9 Ref country code: DE Payment date: 20231127 Year of fee payment: 9 |